28821557792 has 24 divisors (see below), whose sum is σ = 57380003100. Its totient is φ = 14248858624.

The previous prime is 28821557789. The next prime is 28821557819. The reversal of 28821557792 is 29775512882.

It can be written as a sum of positive squares in 2 ways, for example, as 23764072336 + 5057485456 = 154156^2 + 71116^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5057117 + ... + 5062812.

Almost surely, 2^28821557792 is an apocalyptic number.

It is an amenable number.

28821557792 is a deficient number, since it is larger than the sum of its proper divisors (28558445308).

28821557792 is a wasteful number, since it uses less digits than its factorization.

28821557792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10120028 (or 10120020 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 56.

The spelling of 28821557792 in words is "twenty-eight billion, eight hundred twenty-one million, five hundred fifty-seven thousand, seven hundred ninety-two".